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Structures of some common polymers are given. Which one is not correctly presented?

1. Neoprene; −CH2−C≡CH−CH2−CH2− | Cl n
2. Terylene; −OCOC6H4COOCH2CH2O− n
3. Nylon 6,6; [−NH(CH2)6NHCO(CH2)4CO−]n
4. Teflon; (−CF2−CF2−)n

Correct answer: Neoprene; −CH2−C≡CH−CH2−CH2− | Cl n

Solution

The structure given for neoprene is incorrect. Neoprene is a polymer of chloroprene (2-chloro-1,3-butadiene) and its correct structure is −[CH2−C(Cl)=CH−CH2]n−.

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